shadow like v shape no lights about no more then 1000 and 1500 ft. in the sky

Hi cant really give to much info me my girlfriend were sitting out side and she told me to look and did it was something ive never seen before it was gray v shape and shadow like. when she first saw it, it was moving at a slow rate of speed as i looked it was moving so fast i just saw the tail end of it. So i have know ideal what it was .